Small pullet struggling and laying LARGE eggs

I have a 20 week old Easter Egger, Ramona, who is the smallest, runtiest chicken I own. She has been laying eggs for almost three weeks now. The first four were small, as I expected them to be, and came on back to back days. Now she is laying large, 2.0 - 2.2 oz eggs, and laying every two or three days. At first, I was worried that she was egg bound. She was in and out of the nest, and really struggling to lay. Then finally, after seeming to labor for two days, she laid her huge, beautiful, minty green egg. Each time since then, it is the same. She really seems to have a hard time laying, and I'm a little worried about her. Should I be? She squeals, and pants, and the roosters get very fussy over her. Is there anything I can or should do to help her? She eats and drinks like all the other girls. ~ although right after she lays, she stands in the water pan cooling off, guzzling water, and panting. It seems like watching a 5' tall, 100 pound woman naturally deliver a 12 pound baby...every other day!

Here she is next to my SLW boy, same age. She is SO tiny compared to him and all the other girls.

Okay...I need more help. This same little hen (pullet...she's about 24 weeks)did seem to get on a more regular schedule with normal eggs. Then this morning, she was in the nest for about 3 hours trying to lay. Four other girls went in and out of the other box and laid while she just struggled. She squealed a lot throughout the time she was in there. I was expecting another huge egg, but it was normal medium size. But now, she's walking kinda hunch backed, and not eating or drinking. There is something definitely off about her. She seems to have the symptoms of being egg bound, but she laid this morning. Is that possible? She has been laying everyday.

Take a good look at her vent and abdomen make sure nothing obvious is amiss....if you're not sure take some clear pics and post.

Some do often squeal a bit and can sit for quite while when laying.

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Thank you so much! There is nothing obvious there that I can see, except there is something soft that almost feels like a hemorrhoid? This is her. She did poop since I put hey in this cage! That was my biggest concern

Hmm....... she could be having a partial prolapse.
Maybe do some reading up on prolapses...hopefully see some pics of examples and treatments.
I'd keep her isolated and a close eye on her rear end and what comes out of it.